I've learned up on sum lessons on blues and what I think about the 12 Bar blues is that is a chord progression like I+V+IV and if it was in key of Cmaj, the chords played would be Cmaj7 + Gmaj7 + Fmaj7.

And Each chord is played 4 times. Am I right?

And is there a certain special rythem you would play when using the 12 bar blues?

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How would a swing rythem go? Normally when I play chords and try and sound bluesy, i do it using triplets, mute some chords, and use an extensive combonation of up/down strokes. Would you call that somewhat of a swing rythem?

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I I I I (You can also add sevenths to
IV IV I I spice it up a bit)
V IV I I

That's basic blues, play that progession over and over again, and take turns with lead. Just use the blues scale that corresponds to that key (Even though it's not limited to just a blues scale).
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Code:

/ 3 \
swing rythem: e e = q e

Two eight notes together are played like a quarter and eigth note triplet. The easiest way to get that in your head is by saying shuf - ful, Shuf - ful, Shuf - ful, etc...

^Actually, all the chords in standard 12-bar blues are dominant. All of them, all the time.

And Philsopher1989 (threadstarter), your Cmaj7 Fmaj7 Gmaj7 approach to the I IV V would mean you're going off of strict modal chord rules... which then means a true I IV V would be Cmaj7 Fmaj7#11 G7. Just thought I'd chime in there. Blues (major key) is I7 IV7 V7. All dominant.

The typical rhythm is the shuffle. However, this is not always the case. There are often mixes as well... Albert Collins liked to lay shuffle-based (triplets) licks over standard 4/4 time. Some guys inadvertantly pull off standard licks over shuffle (you might also see shuffle as 12/8, depending on tempo of song and such).

Most of SRV's blues stuff is shuffle rhythm... real sweet ideas based on the most basic principles. Same with your Claptons, Kings, etc.

u can just plug ur open string chords (major if u like i asked my guitar teacher who is predominantly a blues player) altho u usualy use ur dominant 7s neways theres also the "bogey wogey" patterns the 2 most common of which r
p5 M6 p5 M6 & p5 M6 m7 M6

so like a perfect fifth on the E and a strings looks like this:
A|-7
E|-5

a Major 6 would look like this
A|-9
E|-5

a minor 7 with look like this
A|-10
E|-5

so part of a 12 bar blues pattern could look like this(p5,M6,p5,M6):
D|----------------------|-7-7-9-9-7-7-9-9|----------------...
A|-7-7-9-9-7-7-9-9-|-5-5-5-5-5-5-5-5-|-7-7-9-9-7-7...
E|-5-5-5-5-5-5-5-5-|----------------------|-5-5-5-5-5-5...
and so on simply plugging in these power chord/intervals into the patterns specified above